id:A101036 - OEIS Search Results

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Weasel numbers: Riesel numbers (n such that n*2^k - 1 is composite for all k >= 1), under the unproved assumption that a Riesel number can be certified by finding a periodic sequence p of prime divisors with p(k) | n*2^k-1.

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509203, 762701, 777149, 790841, 992077, 1106681, 1247173, 1254341, 1330207, 1330319, 1715053, 1730653, 1730681, 1744117, 1830187, 1976473, 2136283, 2251349, 2313487, 2344211, 2554843, 2924861, 3079469, 3177553, 3292241, 3419789, 3423373, 3580901, 3661529, 3661543, 3781541, 3784439, 4384979, 4442323, 4485343, 4506097, 4507889, 4570619, 4626967, 4643293, 4953397, 5049251, 5050147, 6055001, 6610811, 6975809, 7106977, 7117807, 7576559, 7629217, 7790113, 8010517, 8086751, 8101087, 8252819, 8253043, 8482363, 8643209, 9053711, 9053767, 9203917, 9375479, 9545351, 9560713, 9666029, 10157893, 10219379, 10280827, 10581097, 10609769, 10645867, 10702091, 10913233, 10913681, 11124703, 11694013, 11942443, 11947511, 12000697, 12176887, 12431983, 12439151, 12515017, 12515129, 12915463, 12915491, 12973451, 13006807, 13161283 (list; graph; listen)

	OFFSET	`1,1`
	CROSSREFS	`See A076337 for references and additional information. Cf. A076336.` `Sequence in context: A082248 A124945 A076337 this_sequence A123321 A046325 A136352` `Adjacent sequences: A101033 A101034 A101035 this_sequence A101037 A101038 A101039`
	KEYWORD	`nonn`
	AUTHOR	`David W. Wilson (davidwwilson(AT)comcast.net), Jan 17 2005`
	EXTENSIONS	`As far as 3292241, checked by Don Reble (djr(AT)nk.ca), Jan 17 2005, who comments that up to this point each n*2^k-1 has a prime factor <= 241.`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

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